My wife and I were separated over a year ago, and agreed on no alimony or child support, just simple joint custody in which we’d alternate weeks keeping the kids. In our separation agreement, my ex-wife agreed to pay half of what was then a $1000 a month loan payment. The loan was a large bill consolidation that was done during our marriage and was co-signed by my parents. 6 months later, the loan was up for renewal, and my ex refused to sign the loan renewal or pay her half of the monthly bill. The payment was reduced to $850 a month, which I have been paying all of by myself for the last 6 months. As a result of this change, we agreed that our 2 kids would stay with her during the week, and I would only keep them Friday through Sunday every other weekend, just to help offset some of the extra expense to me.
Our divorce is final now - a simple divorce with no alimony, child support or anything. She now wants me to keep the kids more, which I would really love to do, but frankly the extra $350 a month I’m paying really sticks in my craw. Do I have any legal recourse here? Can I legally hold her to paying half of the loan that she agreed to?